Cosmetic chemist Ron Robinson—who has more than 20 years of experience developing bestselling products for Clinique, L’Oreal, and Revlon—takes a no-nonsense approach to skincare that’s rooted in real results and a commitment to only the most necessary and efficacious ingredients. Among his claims to fame? He created the first-ever serum to contain 20% stable and pure vitamin C, thanks to his patented technology, which works to stabilize active ingredients—thus avoiding oxidization and its adverse effects on such ingredients’ effectiveness. Put simply? These are products that work hard—and fast—until the very last drop.